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UNiTEP ES PATE T oFricEQ m m lYm'l m ioruxnomrir l 1 ,357,183, l v 'dpeeilcationothttmht g v Patnted t'zslm crumm -scrim c am- Toallwlwaitmyconcem: v Be it known that we, FRANCIS Joan Pun,-

urs and Enwann JOHN Ross, subjects of the v: o King of Great Britain and Ireland, residing th u n 1 5 at 10 OldBurlingtonStreet, London, Engor t e 1e ma land, have invented'cert'ain new and useful H1655 gm Improvements in the Manufacture of Readar icrnatlve ilv-Soluhle silicates, of which the follow-" ma asse in" is a specification. his invention relates to the preparation of soluble silicates or hydrated silicates o sodium or 'ssium, in which the silicaco I as wig-murmurs b r I s r tent in reation-to the alkali is relatively. "m hi h, I It has been found that the mass reduced 15 The dificnlty of obtaining a solution, or in'the manner described is rendered more a soluble hydrate of, such silicates of high readily soluble, and is much easier to handle 70 silica content is well known, and various att an in, the crude mass usually employed tempts have been made to obviate this difiiwhich generally r uires crushing and culty by means of special solvents, heat grinding although it as been pro o'sed'to :mtreatments and grinding rocesses. 4 drop it miowater in order to brea it into i a s In the manufacture 9 such silieatesthe 4 l6 I materials f which they are derived are 'e have found that if the rolled, squeezed,

first mixed together and fused; the vitreous or extruded material from the furnace be. mass thus obtained is then ground or agidroppeddirectly into water it will break a :5 tated with water to obtain a solution. mto minute particles The invenfion consists, in subjecting the I The silicate pi'oduced in the inanner bemixture obtained by agitating the conjfore described is subsequently placed in a minuted vitreous mass with water to the vessel containing a quantit of am action. of an acid or to an acid forming atm 4 3o mosphere or atmosphere containing acidwe we usua y e p 0y q by weight forming gases; this acid may be gelatinous of water in this operation. silicic acid, or one which precipitates gelat- The whole mass is then continuously r inous silicic acid, which by continued agitaground together by any form of grinder,

tion becomes redissolved into the main solusuch as an edge runner mill or other mecates set out in the following description and t e partic es grin emse ves mto solution by contact, but we do not prefer this method The preferred method of carrying our inas it is less economical. The addition of 60 rention into efi'ect is as follows independent abrasive material, such as sepa- To increase the fusibility of the mixture, rate masses of flint etc. is unnecessary in the G8 which contains ap roximately three parts by grinding process. weight of sand ((360,) to one part of alkali, The m in which the mass is being v (Na,CO, or K, borax may be mixed round or a 'tated ma ,be heated as has 45' with the silica and allmy hand or megeen previously propod with the object of L. chemically and its weight may. be within i the time uired to obtain soln- 10.

the limits t0 total eight, tion. An means 0 eatl ma emthe lower limit being preferred. The mixplo ed such as live steam, a steam pig passtu're is next fused in a furnace, a convenient in ilirough the vessel: an'electric heater etc.

I 35 tion. The invention also consists in the i !n-. chanical means. It is ssible to make a v provedprocessof manufacture of alkali s1l1- solution by continuous agitation whereby an p being 1200 Q soon as t e mass as become practically a When the vitreous mass is in a viscous dissolved, the solution is assed into a fur- 108 uc a sheets cakes or filathe; vessel and further water ma E @3331 Gelatinous si iclc acid is then adda to f the SOIUOOD', continued grinding or agita tion' causes the gelatinous silic'ic' acid-to be i If the'sulfuric -acid 'is employed, the I equivalent quantity se 'rate out-.- 'l'hile almostandy posed to add acidin order to redissolved into the silicate thus a soluble silicate with a; analler percentage of laslekalr and greater of silica than Instead-of addin I gelatinous silicic acid we maya'dd an aci preferably in the form of a fine s ray which precipitates gelatinous ailicic aci We prefer forthis purpose sul- Y tionbut the Of the acid is not a filial iuric acid, and usually employ a 50% solus factor in the operatio of sodium sulfate will be formed which remains in solution and.

which wedo notin general find necessary to acid bum than sulfuric acid may be use em loy carbonic acid.

'e final solution can be evaporated and" reduced to powder or blocks or slabs,

Ordinary commercial silicates have been employed in combination .with other materials such as sawdust, chalk, sand, li'me, etc;, and in some of these cases it has He e xi prosili'cicacid for various purposes such as waance with our invention.

terproofing, but this-additionof acid has not been accompanied by the continued ag1' tation which is necessary to producethe sol- .uble silicate of high silica content. in accordwe claim 15A process metal silicates. or

of manuiaciuring hydrated silicates, consisting in grinding up fused alkali and silica with water and agitating silicic acid into solution with the alkali metal silicate.- SJA, process ,of manufacturing alkali '1 11 metal silicates or hydrated silicates consistin the addition of an acid other than carbonic acid to the, silicate solution obtained by grinding up fused alkali and silica with water, and agitating the silicic-acid thus preciritated solution with the alkali metal si icate. r

.3. A rocess of manufacturing. a1kali metal silicates or hydrated silicates consistthe silicate solution ob-- in in subjecting up fused alkali and silica tamed-by grinding with water, to further agitation in an acid atmosphere the agitation being continued precipitate q ii- 8s until the silicic acid deposited lution with the alkali metal silicate. 4. A rocess of manufacturing.

into) silicates or hydrated silicates mmg m sub ectmg the silicate solution obby grinding up fused alkali and .with water, to further agitation in an at-' mosphere of acid-forming gases the 'ta tron being continued until the silicic aci depositedfiasses mtoaolution with the metals: cater A process of manufacturing metal silicates or hydrated silicates consisting in the addition of an acidother than carbonic acid in the form ofa fine t ray to the silicate solution obtained by grin up fused alkali and silica with water, and agisolution with the alkali metal silicate.

6. A process of manufacturing silicates or hydrated silicates of sodium or potasium' consisting in adding borax to'the mixture of silica and alkali, fusing, breaking up,

.grindin'g with water into solution, adding an tating the silicic acid thus precipitated into we do not propose to acid, and then grinding or agitating r in the presence of water.

#7. A process of manufacturing silicates 01- hydrated silicates ofisodium 'or potassium conslstl'ng in adding borax to the dry mixture of silica and alkali, fusing, break :up, grinding with water into solution, a ding silicic acid, and then grinding or further in the presence of water.

alkali .8. A process of manufacturing silicates or hydrated silicates of sodium "or potassium consisting in adding borax to .the dry mixture of silica and alkali, fusing, breaking up, grinding'nithwater into solution, adding an acid, then grinding or agitating further in 4 6 presence of-water and evaporating to the ess. 9. A. p hydrated ture of silica and alkali ther in the presence o wa er, an

tures.

EDWARD J. ROSE.

of manufacturing o1" H silicates of sodium or consisting in adding borax to the'dry 

